Question

What is the particle unit for SO42-?

Answer 1

Answer: The particle unit is an ion.

Explanation: The unit which is common used for the substances is Mole. 1 mole of anything equals to Avogadro number which is
`6.022*10^2^3` .

For example, 1 mole of an electron equals to
`6.022*10^2^3` electrons,

1 mole of an atom equals to
`6.022*10^2^3` atoms.

So, 1 mole equals to
`6.022*10^2^3` particles.

`SO_4^-^2` is sulfate ion. So, the particle unit for this will be an ion.

Answer 2

I believe that what is meant here to be particle unit is the elementary charge of the compound SO4^2-. In this case, the whole compound is raised to the power of 2-, therefore the elementary charge is 2-, this is the total electrons that the compound is carrying or sharing. These 2 electrons are being shared with 2 hydrogen atoms to form H2SO4.

Answer:

2-